Circuit arrangement for different color light emission

Details Circuit arrangement for different color light emission Circuit arrangement for different color light emission

1982-06-11

1983-12-13

Laroche, Eugene R.

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Plural load device regulation

315201, 315208, 315324, 340704, 340782, H05B 3702

Patent

active

044207115

ABSTRACT:
A circuit arrangement for different color light emission, comprises first series circuit of a first light-emitting element having a given color, a diode, and a resistor; and a second series circuit of a second light-emitting element having another color and a collector-emitter path of a transistor, where the transistor is responsive to an input control signal so as to change a current flowing therethrough. The first and second series circuits are connected in parallel and are interposed between two terminals of a power source. The impedance of the first series circuit is selected to be much greater than that of the second series circuit when the transistor is conductive. When the voltage of the input control signal is below a predetermined level, the transistor is kept nonconductive so that only the first light-emitting element is energized. As the voltage of the input control signal exceeds the predetermined level, a current start flowing through the transistor to cause both the first and second light-emitting elements to emit light. As the voltage further rises, only the second light-emitting element is energized. The different color light from the two light-emitting elements may be mixed to produce third color light.

REFERENCES:
patent: 4298869 (1981-11-01), Okuno
patent: 4348616 (1982-09-01), Tanaka et al.
Lyons et al., Light-Emitting Diode Circuit, IBM Technical Disclosure Bulletin, vol. 14, No. 12, May 1972, p. 3580.

Affiliated with

Also associated with

Rating

Circuit arrangement for different color light emission does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Circuit arrangement for different color light emission, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Circuit arrangement for different color light emission will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-805879